Heat conduction in the cable insulation of force-cooled underground electrical power transmission systems
Name
MIT-EL-74-004-02035744.pdf
Size
8.18 MB
Format
Adobe PDF
Checksum (MD5)
2842a8292949aa270b7b3aedf274f7c7
Author(s)
Sanders, Joel Vincent
Glicksman, Leon R.
Rohsenow, Warren Max
Date Issued
1974
Publisher
MIT Energy Lab
Series/Report no.
MIT-EL
74-004
Abstract
Forced-cooled systems for oil-filled pipe-type cable circuits have
recently been considered. In such systems the conduction resistance
through the paper insulation of the cables is the limiting thermal resistance.
Assuming bilateral symmetry, steady-state conditions, and two-dimensional
heat transfer, a FORTRAN IV computer program was written to solve the heat
conduction problem in the cable insulation for arbitrary configurations
of a three-cable system.
For a steel pipe, a cable system is most susceptible to overheating
in the equilateral configuration with the three cables touching.
Proximity effects are very significant in forced cooling, especially
when cables are not provided with a copper tape under the insulation moisture
seal assembly, accounting for as much as 21% of the total oil temperature
rise between refrigeration stations. This figure, however, is reduced to
8% when 0.005 inch thick copper tape is present.
Description
Forced cooling of underground electric power transmission lines, pt.2
Subjects
Underground electric lines -- Cooling
Heat -- Conduction
Electric cables
Electric insulators and insulation
Persistent DSpace Link
